Bingo. As a senior engineer, I get startup offers at the Staff-Principal levels, and even those grant no more than 0.1-0.5% equity at most, on top of ~$180-200k salary.
That simply isn't competitive with big established companies like FAANG that offer me $400k+, far better career growth prospects, and far lower risk.
For most startups, the equity will be worthless, and the whole company will either shut down or get acquired, which means you won't have a straightforward career path no matter how hard you work and how many impressive accomplishments you achieve. Meanwhile your friends over at FAANG will be earning twice as much and climbing the promotion ladder simply for doing a good job.
Finally, let's not forget the abhorrent tax treatment that screws you, especially as a senior engineer: while your options will likely end up worthless, you'll have to pay tax for them as if they're worth their weight in gold. That puts a whole new level of risk on the already bad and risky deal of working at startups.
It's beyond me how that tax treatment was allowed to continue given how bad it is for startups, and how much it advantages big established companies that are already deep in anti-trust territory, though I guess that could also be the answer to why it's still the rule.